Question

convert the sentence into passive voice .a. you must do it at once​

Answer 1

$\huge \sf \underline \red{Ꭺnѕwєr}$

$\implies$At once it must be done by you.

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$\bf\underline \blue{LEARN \: MORE }$

In a sentence using passive voice, the subject is acted upon; he or she receives the action expressed by the verb. The agent performing the action may appear in a "by the..." phrase or may be omitted. The dog is acting upon the sentence subject (the boy), meaning it uses the passive voice.